To ensure reliability, purchase GM part # 12539085 Piston,(W/Pinion). It is sometimes referred to as GM Piston. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Park Avenue, Regal, Riviera models. It fits Chevrolet Impala, Monte Carlo. It also fits Oldsmobile 88. This also fits Pontiac Bonneville, Grand Prix.
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